diff --git a/src/parallel_io.c b/src/parallel_io.c
index 5b99855a7a2200ada9796e2a6f7f3358a27ab06d..f073104e890f4ad33be92c0c9ceef3721c9f18aa 100644
--- a/src/parallel_io.c
+++ b/src/parallel_io.c
@@ -342,6 +342,8 @@ void readArray(hid_t grp, struct io_props props, size_t N, long long N_total,
       props.parts += max_chunk_size;                  /* part* on the part */
       props.xparts += max_chunk_size;                 /* xpart* on the xpart */
       props.gparts += max_chunk_size;                 /* gpart* on the gpart */
+      props.sparts += max_chunk_size;                 /* spart* on the spart */
+      props.bparts += max_chunk_size;                 /* bpart* on the bpart */
       offset += max_chunk_size;
       redo = 1;
     } else {
@@ -646,6 +648,8 @@ void writeArray(struct engine* e, hid_t grp, char* fileName,
       props.parts += max_chunk_size;                  /* part* on the part */
       props.xparts += max_chunk_size;                 /* xpart* on the xpart */
       props.gparts += max_chunk_size;                 /* gpart* on the gpart */
+      props.sparts += max_chunk_size;                 /* spart* on the spart */
+      props.bparts += max_chunk_size;                 /* bpart* on the bpart */
       offset += max_chunk_size;
       redo = 1;
     } else {